15. CONCENTRATIONS

Tenant Revenue Concentrations—Rental revenues from the U.S. General Services Administration and other government agencies (collectively, "Governmental Tenants"), which primarily occupy properties located in Washington, D.C., accounted for approximately 22.9% and 24.5% of our rental and other property income for the three months ended June 30, 2015 and 2014, respectively, and 22.8% and 25.1% for the six months ended June 30, 2015 and 2014, respectively. At June 30, 2015 and December 31, 2014, $6,915,000 and $7,168,000, respectively, was due from Governmental Tenants (see Note 14).

Geographical Concentrations of Investments in Real Estate—As of June 30, 2015 and December 31, 2014, we owned 21 office properties, five multifamily properties, and three hotel properties, located in four states and Washington, D.C.

Our revenue concentrations from properties are as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
California		63.0	%		60.2	%		62.8	%		60.3	%
Washington, D.C.		24.5			23.9			24.2			24.3
Texas		7.8			7.7			7.6			7.7
North Carolina		4.5			6.1			4.5			5.6
New York		0.2			2.1			0.9			2.1

		100.0	%		100.0	%		100.0	%		100.0	%

Our real estate investment concentrations from properties are as follows:

	June 30, 2015			December 31, 2014
California		52.5	%		52.3	%
Washington, D.C.		31.1			31.2
Texas		7.4			7.4
North Carolina		5.4			5.5
New York		3.6			3.6

		100.0	%		100.0	%